Site selectivity of benzene adsorption on Ni(111) studied by high-resolution x-ray photoelectron spectroscopy

Papp, Christian; Fuhrmann, Thomas; Tränkenschuh, B.; Denecke, R.; Steinrück, Hans‐Peter

doi:10.1103/physrevb.73.235426

Cited by 25 publications

(37 citation statements)

References 33 publications

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“…The C 1s spectra were recorded using a photon energy of 380 eV, with a resolution set to approximately 200 meV. The carbon coverage is calibrated by comparison to a saturated well‐ordered (√7×√7) R 19.1° benzene layer with a known carbon coverage of 0.86 ML 25. Note that the unit 1 ML corresponds to one carbon atom per nickel surface atom; thus, one perfect graphene layer corresponds to a coverage of 2.0 ML carbon atoms, as it contains two carbon atoms per (1×1) nickel unit cell.…”

Section: Methodsmentioning

confidence: 99%

Reversible Hydrogenation of Graphene on Ni(111)—Synthesis of “Graphone”

Zhao

Gebhardt

Späth

et al. 2015

Chemistry A European J

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Understanding the adsorption and reaction between hydrogen and graphene is of fundamental importance for developing graphene-based concepts for hydrogen storage and for the chemical functionalization of graphene by hydrogenation. Recently, theoretical studies of single-sided hydrogenated graphene, so called graphone, predicted it to be a promising semiconductor for applications in graphene-based electronics. Here, we report on the synthesis of graphone bound to a Ni(111) surface. We investigate the formation process by X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD), and density-functional theory calculations, showing that the hydrogenation of graphene with atomic hydrogen indeed leads to graphone, that is, a hydrogen coverage of 1 ML (4.2 wt %). The dehydrogenation of graphone reveals complex desorption processes that are attributed to coverage-dependent changes in the activation energies for the associative desorption of hydrogen as molecular H2 .

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Section: Methodsmentioning

confidence: 99%

Reversible Hydrogenation of Graphene on Ni(111)—Synthesis of “Graphone”

Zhao

Gebhardt

Späth

et al. 2015

Chemistry A European J

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“…All XP spectra are taken with a photon energy of 380 eV and an overall resolution of 200 meV at normal emission. The boron concentration was calibrated from the adsorption of TEB at 130 K: we compared the TEB carbon intensity to the known intensity of a saturated benzene layer on Ni(111) at 200 K 26 . From this we calibrated the boron coverage from the known boron content in TEB.…”

Section: Experimental Setup and Computational Detailsmentioning

confidence: 99%

Growth and electronic structure of boron-doped graphene

et al. 2013

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The doping of graphene to tune its electronic structure is essential for its further use in carbon based electronics. Adapting strategies from classical silicon based semiconductor technology, we use the incorporation of heteroatoms in the 2D graphene network as a straightforward way to achieve this goal. Here, we report on the synthesis of boron-doped graphene on Ni (111) calculations. Furthermore, our calculations suggest that doping with boron leads to graphene preferentially adsorbed in the top-fcc geometry, since the boron atoms in the graphene lattice are then adsorbed at substrate fcc-hollow sites. The smaller adsorption distance of boron compared to carbon leads to a bending of the graphene sheet in the vicinity of the boron atoms. By comparing calculations of doped and undoped graphene on Ni(111), as well as the respective free-standing cases, we are able to distinguish between the effects that doping and adsorption have on the band structure of graphene. Both, doping and bonding to the surface, result in opposing shifts on the graphene bands.

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“…It is proposed as a future substitute for 26 silicon in semiconductor industries. Another potential application field 27 is gas sensors, due to graphene's specific electronic structure that can 28 easily be manipulated by adsorption.…”

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confidence: 99%

“…superstructure on Ni(111)[26]. The Ar coverages were determined115 by comparison of the Ar 2p 3/2 peaks areas to the C 1s peak area of the 116 saturated graphene layer on Ni(111) with a coverage of 2 ML carbon, 117 considering the ionization cross sections at a photon energy of 380 eV 118 [27].…”

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confidence: 99%